Bring the water or stock to a boil over high heat in a small pot. Add the lentils and let boil for 1 minute.
Reduce heat to low, cover and simmer for 30-45 minutes until all the liquid is absorbed and the lentils are very soft.
Pour water into a large pot until it is about 1.5” deep and bring to a boil over high heat.
Place the sweet potato and apple into a stainless steel steamer basket and place the basket into the pot. Make sure the water isn’t touching the bottom of the basket. Cover and steam for 10 minutes until sweet potato is cooked through and very soft.
Place the lentils, sweet potato and apple into a blender or food processor and pulse until smooth, but slightly chunky.